JP3325353B2 - Metal frame for frameless mold making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal frame used for molding a frameless mold having no mold, and is particularly advantageously applied to the molding of a mold for small castings and the like. The present invention relates to a metal frame for a frameless mold making machine capable of improving the filling property.

[0002]

2. Description of the Related Art Conventionally, as a kind of a molding machine, a predetermined molding space is formed in each of two metal frames by overlapping a pair of metal frames with a pattern plate on which a model is integrally formed. Then, by filling a molding sand into the molding space and compacting it, a predetermined mold is molded, and then a frameless mold is obtained by extracting the mold from a metal frame. Molding machines are known.

[0003] Incidentally, the metal frame in such a frameless type mold molding machine is generally provided with one or a plurality of sand supply ports on a peripheral wall portion thereof, and molding sand is compressed through the sand supply ports. It is designed to be filled with air. In addition, the casting sand is left in the sand supply port of the metal frame after extracting the mold from the metal frame, but usually, the molding operation as described above is repeatedly and continuously performed. The remaining sand is supplied to the molding space when molding sand is supplied to mold the next mold.

[0004] However, the molding sand left in the sand supply port of the metal frame is filled to the same or slightly lower level as the mold due to the action of compressed air blown for sand supply and the pressing force exerted during compaction. It is a sand mass compacted by density. For this reason, there is a possibility that the sand mass is supplied to the molding space at the time of the next mold molding, thereby adversely affecting the filling property of the molding sand, and in particular, such a sand mass forms a casting cavity. If it is positioned on the surface, there is a serious problem that the desired casting cavity shape cannot be obtained and this causes casting defects and the like.

[0005] In order to cope with such a problem, conventionally, for example, sand lumps left in the sand supply port of a metal frame have been removed for each molding cycle. However, there is a problem that the operation of removing such a sand mass is extremely troublesome, and a delay in the molding speed is unavoidable.

It is also conceivable that the pressure of the blowing compressed air at the time of supplying the sand is increased, and the sand mass remaining at the sand supply port of the metal frame is crushed against the inner surface of the molding space by an impact force. However, when the pressure of the compressed air for blowing is increased, the packing density of the sand lumps increases, and the size of the crushed sand lumps is not constant, so that it is difficult to obtain a stable crushing effect, and the quality of the obtained mold is reduced. There was a problem that it was not stable. Furthermore, when the pressure of the compressed air for blowing is increased, the amount of wear on the sand supply port and the model increases, so that problems such as a decrease in dimensional accuracy and an increase in molding cost are unavoidable, and this is not an effective method. It was.

[0007]

Here, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent an adverse effect caused by a lump of sand left in a sand supply port. An object of the present invention is to provide a metal frame for a frameless molding machine capable of stably obtaining an excellent filling property of molding sand into a molding space.

Further, according to the present invention, it is possible to prevent the adverse effect of the sand mass left in the sand supply port without complicating the operation, delaying the molding speed, or significantly increasing the pressure of the compressed air for blowing. It is also an object to provide a frame for a frameless mold making machine that can be advantageously and stably achieved.

[0009]

In order to solve such a problem, a feature of the present invention is that a model is integrally formed.
Of a pair of metal frames with the pattern plate
By making them, the prescribed molding is
While forming the space, the peripheral wall of both metal frames respectively
Through one or more sand supply ports provided,
By filling the molding space with molding sand and compacting it
Then, mold a predetermined mold, and further mold the molded mold,
By extracting from the metal frame using a mold removal device,
In a frameless mold making machine that obtains a frameless mold
The metal frame to be used in the sand supply port of the metal frame.
A partition member for dividing the sand supply port into a plurality of divided ports.
While detachably attached, the dividing port of the partition member
Each compartment to be provided is located at the inner opening of the sand supply port
As described above, the partition member is provided .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 schematically shows a frameless mold making machine comprising an upper frame 10 and a lower frame 12 as metal frames constructed according to the present invention. In such a frameless type mold making machine, the upper frame 10 and the lower frame 12 have a substantially rectangular frame shape, and are supported by a guide bar 14 provided on a support base 16 so as to be movable toward and away from each other. It has been impatient. Further, a support base 16 for supporting the upper frame 10 and the lower frame 12 is provided with a reversing cylinder 18.
Thereby, it can be rotated by about 90 degrees in the direction of the arrow in the figure. Further, as indicated by a virtual line in the drawing, at the rotation position of the support base 16 where the upper frame 10 and the lower frame 12 are superimposed in the horizontal direction,
An upper squeezing device 20 and a lower squeezing device 22 each having a squeezing head 19 as a compression plate, which are located on both sides of the upper frame 10 and the lower frame 12 in the overlapping direction,
A blow device 23 is provided above each of the upper frame 10 and the lower frame 12. On the other hand, as shown by a solid line in the figure, the upper frame 10 and the lower frame 12 are rotated at the rotational position of the support base 16 where the upper frame 10 and the lower frame 12 are overlapped in the vertical direction. Are located on both sides in the direction of superposition of the mold, respectively, a mold removing device 24 and a mold receiving device 26 are provided.

When molding a mold by the frameless mold molding machine having such a structure, first, when the support 16 is rotated as shown by a solid line in FIG. As shown in the drawing, a model 28 molded into a required casting shape is integrally formed at a central portion between the opposing surfaces of the upper frame 10 and the lower frame 12 by a pattern transfer device (not shown). The pattern plate 30 is guided and positioned, and the upper frame 10 and the lower frame 12 are overlapped with the pattern plate 30 interposed therebetween.

Thereafter, as shown in FIG. 3, the support base 16 is turned to a turning position as shown by a virtual line in FIG. The squeeze heads 19 and 19 of the upper squeezing device 20 and the lower squeezing device 22 are fitted into the outer openings, respectively. Molding space 34,
34 are formed. Further, a squeeze bar 35 is provided upright on the squeeze head 19 of the upper squeeze device 20, and the tip end surface thereof is brought into contact with the pattern plate 30 in the molding space 34.

In this state, through the sand supply ports 36 provided in the upper frame 10 and the lower frame 12, and into the molding spaces 34, 34 from the blowing device 23,
The casting sand 38 is supplied and filled. Furthermore, this casting sand 38
After the filling, the two squeeze heads 19, 19 in the upper and lower squeezing devices 20, 22 are displaced in a direction approaching each other with a predetermined pressure, and the molding sand 38 is compression-molded, thereby forming an upper mold as a mold. 40 and lower mold 4
2 are formed (see FIG. 4).

After forming the upper die 40 and the lower die 42, the squeeze heads 19 in the upper and lower squeezing devices 20, 22 are released. Simultaneously with the release of the squeeze heads 19, 19, the squeeze bar 35
Also, the gate 43 having a shape corresponding to the gate 35 is formed inside the upper die 40 as shown in FIG.
reference).

Further, after the squeeze heads 19 are released from the mold, the support base 16 is turned to a turning position as shown by a solid line in FIG. 1, and as shown in FIG. When the upper frame 10 and the lower frame 12 are separated from each other, the pattern plate 30 having the model 28 is removed from the upper mold 40 and the lower mold 42.

Then, the pattern plate 30 is removed, and if necessary, a core is inserted.
As shown in FIG. 3, the upper frame 10 and the lower frame 12 are again overlapped, and the upper mold 40 and the lower mold 42 are overlapped by the mold removing device 24. The molded mold is extracted from the frame 12 onto the mold receiving device 26. As a result, as shown in FIG. 7, the casting cavity 44 having a predetermined shape and the casting cavity 44 are formed.
Thus, a desired frameless mold is obtained in which the sprue 43 communicating with the mold is formed inside.

By the way, as shown in FIGS. 8 to 10, the sand supply ports 36 in the upper frame 10 and the lower frame 12 mounted on the mold molding machine having such a structure are respectively shown in FIG. In the peripheral wall portion which is positioned upward at the rotation position indicated by the imaginary line, the peripheral wall portion is formed to have a long rectangular window shape extending in the circumferential direction. The structures of the sand supply ports 36 in the upper frame 10 and the lower frame 12 are substantially the same, and only the upper frame 10 is shown in FIGS.

A partition member 50 is fitted and attached to the sand supply port 36. The partition member 50 has a rod-like shape having a length substantially the same as the short side dimension of the sand supply port 36 with respect to a long flat plate-like connecting portion 52 having a length substantially the same as the long side dimension of the sand supply port 36. Are arranged in a standing manner at predetermined intervals, and have a rough comb-like tooth shape as a whole. In addition, the partitioning portion 54 is in the width direction of the connecting portion 52 (the left-right direction in FIG. 8).
A mounting piece 56 that is formed at one end and that is bent integrally with the other end in the width direction of the connecting portion 52 in the direction opposite to the direction in which the partitioning portion 54 projects is integrally formed. Have been.

The partition member 50 is connected to the upper frame 10.
In the state where the connecting portion 52 is superimposed on the inner surface of one long side of the sand supply port 36,
The bolt 58 inserted through the mounting piece 56 allows the upper frame 10
It is stuck to. Further, under such an arrangement state, each partitioning portion 54 of the partition member 50 is positioned at the inner opening of the sand supply port 36, and from one long side of the sand supply port 36 to the other long side. The protruding front end surface is brought into contact with the inner surface of the other long side portion of the sand supply port 36.

Accordingly, the sand supply port 36 is partitioned at the inner opening by the partitioning portion 54 of the partition member, so that the sand supply port 36 is positioned in the inner opening of the sand supply port 36 along the long side direction. In this example, a plurality of
(0) divided ports 60 are formed. In addition, the material of the partition member 50 is not particularly limited, but in order to secure strength and durability to withstand the compressed air pressure exerted when the molding sand is supplied into the frame, a metal material is preferably adopted. obtain.

Therefore, the upper and lower frames 1 having such a structure are provided.
0, 12, when the molding sand 38 is supplied and filled into the molding space 34 formed in the frame as described above, the molding sand 38 is supplied to each of the divided ports 60 formed in the sand supply port 36.
Is supplied to the inside of the frames 10 and 12, the sand mass of the casting sand left in the sand supply port 36 in the previous molding cycle is also supplied to the inside of the frame at the maximum at the time of the division port 60. It will be severely cut or crushed.

As described above, since the sand mass of the molding sand left in the sand supply port 36 is reduced in size, the filling of the molding sand into the molding space 34 due to the sand mass is deteriorated. Can be advantageously reduced or prevented, and even when such a sand mass is positioned on the surface of the model forming the casting cavity, the occurrence of the unfilled portion of the casting sand is prevented, and the desired casting cavity shape is obtained. Can be obtained advantageously and stably.

The standing interval of the partition 54 in the partition member 50 should be determined according to the shape of the model 28 (the desired shape of the casting cavity), the air pressure to be used, the type of molding sand, and the like. Yes, but not limited, in order to obtain an effective effect of improving the fillability of molding sand, it is generally desirable to set the diameter to 50 mm or less, while the contact resistance between the molding sand and the partition member 50 is reduced. Considering the increase, 1
It is desirable to set it to 0 mm or more.

In the present embodiment, since the partitioning portion 54 of the partition member 50 is disposed at the inner opening of the sand supply port 36, the sand mass of the molding sand left in the sand supply port 36. But,
When the molding sand is supplied into the molding space 34, it can be completely crushed or cut at least up to the size of the dividing port 60, and a stable effect can be exhibited.

Further, in the present embodiment, the partitioning portion 54 of the partition member 50 is not located in the sand supply port 36 over the entire length in the thickness direction of the upper and lower frames 10 and 12, and Since it is provided only in the opening inside the opening 36, there is an effect that the increase in frictional resistance due to the contact between the partition 54 and the supplied molding sand is also effectively suppressed.

Further, the partition member 50 includes upper and lower frames 10, 1
2, the partition member 50 can be easily replaced even when worn due to contact with the molding sand supplied to the molding space 34. It is also extremely economical.

In addition, the partition member 50 is provided with upper and lower frames 10 and 12.
Can be attached to and detached from the partition member 50 according to the shape of the model 28 and the material of the molding sand to be used.
Can be replaced by one having a different arrangement interval of the partitioning portions 54, and an appropriate cutting or crushing effect can be selectively obtained.

Next, FIG. 11 to FIG.
Another specific example of a partition member that can be employed in the upper and lower frames 10 and 12 as described above is shown. In addition, these FIG.
In the specific examples shown in 1 to 13, the same parts as those in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment, and a detailed description thereof will be omitted.

That is, the partition member 64 shown in FIG.
The partitioning portion 54 has a plurality of vertical bars 66 erected on the connecting portion 52 and a single horizontal bar extending in the longitudinal direction by connecting the central portions of the vertical bars 66 to each other. And a unit 68. By employing such a partition member 64, even when the short side dimension of the sand supply port 36 is large,
The miniaturization of the sand mass can be advantageously achieved.

The partition member 70 shown in FIG.
A pair of connecting portions 5 opposed to each other at a predetermined distance from each other
2 and 52, and a thin wire 72 such as a piano wire is arranged at a predetermined interval so as to straddle the connecting portions 52 and 52. The partition 54 is constituted by the plurality of thin wires 72. If such a partition member 70 is employed, the contact resistance between the molding sand and the partitioning portion 54 can be further reduced. Therefore, the arrangement interval of the fine wires 72 is reduced to 10 mm or less, and the upper and lower frames 10 are reduced. , 12 can be easily cut or crushed to a smaller size.

Further, the partition member 74 shown in FIG.
In, the partitioning portion 54 is constituted by a plate 78 in which a plurality of through holes 76 are perforated. Even with such a partition member 74, the same effect as in the above embodiment can be effectively exhibited.

Although the embodiments of the present invention have been described above in detail, these are literal examples, and the present invention is not construed as being limited to only such specific examples.

For example, the mounting structure of the partition member to the metal frame is not limited at all, and various detachable mounting structures such as bolt fastening and fitting fastening can be appropriately adopted.

Further, the shape of the division opening formed by the partition member is not limited to a rectangular shape or a circular shape, but
Various split port shapes can be employed. For example, as shown in FIG. 12, when a partition member is formed using thin lines, a mesh-shaped division opening can be formed by many thin lines.

Further, the partition member provided at the sand supply port of the metal frame does not need to be an integral structure, and a partition member having a plurality of divided structures may be used.

The division openings formed by the partition members need not be completely independent of each other, but may be partially continuous. That is, even if such a partially continuous dividing port is substantially divided, the small lumps of molding sand remaining there may cause a slight impact when supplied to the molding space. Therefore, the effect of the present invention can be sufficiently exhibited.

Further, the present invention can be similarly applied to a metal frame having a plurality of sand supply ports.

In addition, in the frameless mold molding machine exemplified in the above embodiment, the molding sand is supplied and filled into the sand supply port of the metal frame from above in the vertical direction.
In addition, the present invention can be similarly applied to a metal frame for a horizontal blowing type mold molding machine that supplies casting sand from a horizontal direction to the sand supply port of the metal frame and fills it. is there.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0041]

As is clear from the above description, in the metal frame for a frameless type molding machine having the structure according to the present invention, the sand lumps of molding sand remaining in the sand supply port are transferred to the molding space. At the time of supply, since it is reduced to the size of the dividing port by the cutting or crushing action of the partition member, it is not necessary to remove each sand block or to crush it with high air pressure, and to mold molding sand. The filling of the space can be improved easily and advantageously.

Further, in such a frame for a frameless mold making machine, the partition member is detachably attached to the frame, and is easily replaced. In addition to being able to easily deal with the situation, depending on the desired cavity shape and the material of the molding sand to be used,
It is also possible to appropriately replace the partition member with an appropriate division opening shape.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a frameless mold making machine provided with an upper frame and a lower frame as one embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining one process of molding by the frameless mold molding machine shown in FIG.

FIG. 3 is an explanatory diagram for explaining a molding step following the step shown in FIG. 2;

FIG. 4 is an explanatory diagram for explaining a molding step following the step shown in FIG. 3;

FIG. 5 is an explanatory diagram for explaining a molding step following the step shown in FIG. 4;

FIG. 6 is an explanatory diagram for explaining a molding step following the step shown in FIG. 5;

FIG. 7 is an explanatory diagram for explaining a molding step following the step shown in FIG. 6;

8 is a longitudinal sectional view showing an upper frame used in the frameless mold making machine shown in FIG. 1 and corresponding to a VIII-VIII section in FIG. 9;

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a left side view in FIG.

FIG. 11 is a front view showing another specific example of a partition member that can be used in the metal frame for a frameless mold making machine according to the present invention.

FIG. 12 is a front view showing still another specific example of the partition member that can be used in the metal frame for a frameless mold making machine according to the present invention.

FIG. 13 is a front view showing still another specific example of the partition member that can be used in the metal frame for a frameless mold making machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Upper frame 12 Lower frame 28 Model 34 Molding space 36 Sand supply port 38 Casting sand 40 Upper mold 42 Lower mold 50, 64, 70, 74 Partition member 58 Bolt 60 Dividing port

Claims (1)

(57) [Claims] 1. A pattern preform in which a model is integrally formed.
By placing a pair of metal frames on top of each other,
One is to form a predetermined modeling space inside each of these two metal frames.
One on each of the peripheral walls of both metal frames
Or through a plurality of sand supply ports into the molding space.
Filling and compacting, the specified mold
Mold, and further mold the molded mold using a mold removal device
To obtain a frameless mold.
Used in a frameless mold making machine
A frame is provided, and the sand supply port is divided into a plurality of divided ports in the sand supply port of the metal frame.
The partition member is detachably attached to the
Each partition part of the partition member that provides the division port is the sand supply port.
The partition member is disposed so as to be located at the inside opening of the
A metal frame for a frameless mold making machine.